Fungicide stewardship advice updated following loss of CTL

However, the principle of using the lowest resistance risk options and limiting the use of higher-risk options within fungicide programmes remains core to resistance management advice, it adds.

“Although other multisite fungicides are not as effective as chlorothalonil against septoria leaf blotch and carry some additional cost, the inclusion of lower resistance risk chemistry – such as the multisite fungicides folpet and mancozeb – is still useful in reducing reliance on other higher-risk chemistry.”

The use of multisite fungicides such as folpet and mancozeb within label recommendations on maximum dose, application number and timing will reduce pressure on higher-risk chemistry, says FRAG.

“Given lower levels of efficacy compared to chlorothalonil, the rates of folpet or mancozeb should be kept high to maximise their efficacy. Note, mancozeb is not approved for use in barley. Take care to stay within label limits for both actives.”